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  • Spring MVC中一般 普通类调用service

    在Spring MVC中,Controller中使用service只需使用注解@Resource就行,但是一般类(即不使用@Controller注解的类)要用到service时,可用如下方法:

    1、SpringContextUtil

    package com.test.framework.utils;
     
    import org.springframework.beans.BeansException;
    import org.springframework.beans.factory.NoSuchBeanDefinitionException;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.ApplicationContextAware;
     
    public class SpringContextUtil implements ApplicationContextAware {
     
        private static ApplicationContext applicationContext; // Spring应用上下文环境
     
        // 下面的这个方法上加了@Override注解,原因是继承ApplicationContextAware接口是必须实现的方法
        @Override
        public void setApplicationContext(ApplicationContext applicationContext)
                throws BeansException {
            SpringContextUtil.applicationContext = applicationContext;
        }
     
        public static ApplicationContext getApplicationContext() {
            return applicationContext;
        }
     
        public static Object getBean(String name) throws BeansException {
            return applicationContext.getBean(name);
        }
     
        public static Object getBean(String name, Class requiredType)
                throws BeansException {
            return applicationContext.getBean(name, requiredType);
        }
     
        public static boolean containsBean(String name) {
            return applicationContext.containsBean(name);
        }
     
        public static boolean isSingleton(String name) throws NoSuchBeanDefinitionException {
            return applicationContext.isSingleton(name);
        }
     
        public static Class getType(String name)    throws NoSuchBeanDefinitionException {
            return applicationContext.getType(name);
        }
     
        public static String[] getAliases(String name) throws NoSuchBeanDefinitionException {
            return applicationContext.getAliases(name);
        }
    }

    2、Spring的配置文件application.xml中进行如下配置

    <bean id="SpringContextUtil" class="com.test.framework.utils.SpringContextUtil" scope="singleton"></bean>

    3、使用

    DictService dictService = (DictService) SpringContextUtil.getBean("dictService");
    List<dict> dict = (List<dict>) dictService.findByHQL(hql);
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  • 原文地址:https://www.cnblogs.com/chen-lhx/p/5410717.html
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